9+ years working exclusively on Shopify — architecture decisions that hold under scale, migrations that don't break what's already working, and performance engineering tied to real metrics.
Selected work
Not demos. Not generic implementations. Projects where architecture decisions had actual consequences — on revenue, performance, and longevity.
3+ years as technical partner for a B Corp-certified sustainable fashion brand (325k+ subscribers, 14k+ Trustpilot reviews). Full manual migration from OS 1.0 to 2.0 — section-by-section rebuild, not a template swap. International expansion across 15+ markets, B2B wholesale, Klaviyo integration, Core Web Vitals. The kind of relationship where architecture decisions actually have consequences.
Built the online store for Moldova's largest pharmacy chain from scratch — and have been their technical partner since 2020. 30,000+ products, custom one-page checkout, fully automated backend connected via APIs. Custom theme architected and implemented for pharmaceutical-grade catalog management at scale.
Shopify Plus redesign for an haute parfumerie brand (Eulalia de Lucia). Full theme build — homepage, product pages, collection views, mobile experience, cart — all designed to match a complete brand relaunch.
Two pharmaceutical Shopify stores built on a custom in-house theme with exceptional performance scores — same robust architecture, adapted per brand.
Shopify App Store
Building apps means understanding both sides — what the merchant actually needs, and what makes an app good enough to survive Shopify's review process.
Generates and customizes Open Graph images for all Shopify resource types via a template-based UI — no coding required. Built to Shopify's highest standards for performance, design, and OS 2.0 integration.
View on Shopify App Store →Built the full admin interface for this published Shopify app — structured data and breadcrumb schema injection for SEO. Delivered using Shopify Polaris and React, following Shopify's embedded app standards.
View on Shopify App Store →AI-powered Instagram content generator for Shopify merchants. Generates ready-to-post content from product and collection data using GPT-4o-mini and the Instagram Graph API.
Not published yetWhat I do
I don't take isolated tasks. I take on problems that require architectural thinking — and I stay until they're solved properly.
OS 2.0 section/block systems, metafields, metaobjects — built to last, not to demo.
Core Web Vitals tied to real metrics. Custom build tooling, lazy loading, bfcache.
Manual OS 1.0 → 2.0 migrations that preserve what's working. No shortcuts.
Multi-region setup, localized content, payment methods, tax and shipping rules.
Custom apps with React/Polaris, Node.js, built to pass Shopify's review process.
Storefront API, GraphQL, Checkout Extensions, Shopify Flow, Webhooks.
About
I've been working exclusively on Shopify since 2016. Not across five platforms. Not as a side skill. This is the only thing I do — and that depth is what separates the work.
I specialize in the layer most developers skip: architecture decisions that hold under scale, migrations that don't break what's already working, and performance engineering tied to real metrics — not just Lighthouse scores.
In practice, that means a 3-year technical partnership with twothirds.com — a B Corp-certified sustainable fashion brand with 325k+ subscribers and 14k+ Trustpilot reviews. Full manual OS 1.0 → 2.0 migration, international expansion across 15+ markets, B2B wholesale, Klaviyo integration, ongoing performance engineering.
It means building ff.md from scratch in 2020 — the online platform for Moldova's largest pharmacy chain — and staying as their technical partner ever since. 30,000+ products, custom one-page checkout, fully automated backend via APIs.
And it means building and publishing my own apps on the Shopify App Store — understanding both what merchants actually need from an app, and what it takes to pass Shopify's review process.
The clients I work with don't need someone to install a theme. They need someone who knows when the easy option will cost them six months later.
Not looking for task-based freelancing. Looking for the kind of problem where architecture actually matters.
hello@costinas.com →